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Structures and electric properties of pitch-based carbon fibers heat-treated at various temperatures

Published online by Cambridge University Press:  31 January 2011

T. Hamada
Affiliation:
Nippon Steel Corporation R & D Laboratories-1, 1618 Ida, Nakahara-ku, Kawasaki 211, Japan
M. Furuyama
Affiliation:
Nippon Steel Corporation R & D Laboratories-1, 1618 Ida, Nakahara-ku, Kawasaki 211, Japan
Y. Sajiki
Affiliation:
Nippon Steel Corporation R & D Laboratories-1, 1618 Ida, Nakahara-ku, Kawasaki 211, Japan
T. Tomioka
Affiliation:
Nippon Steel Corporation R & D Laboratories-1, 1618 Ida, Nakahara-ku, Kawasaki 211, Japan
M. Endo
Affiliation:
Faculty of Engineering, Shinshu University, 500, Wakasato, Nagano 380, Japan
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Abstract

Four kinds of pitch precursor fibers possessing different mean sizes of mesophase domains in their transverse sections, but having the same chemical constituents, were prepared by controlling only the spinning conditions. The fibers were thermoset and heat-treated at various temperatures from 600°C to 3300 °C. Lc (002) or d002 vs THT curves showed that pitch precursor fibers with finer transverse microstructures have a lower degree of graphitizability. Further, these four kinds of fibers exhibited systematically different d002 vs Lc (002) curves. The resistivity at room temperature is dependent on d002, being independent of the mean size of the mesophase domains in the transverse section of the pitch precursor fiber. The transverse magnetoresistance at 77 K and 10 kG, (Δρ/ρ)t, also showed a universal dependence on d002 if (Δρ/ρ)t was positive. However, the (Δρ/ρ)t vs d002 curves seemed to be slightly split in the negative region of (Δρ/ρ)t for each of the four kinds of fibers.

Type
Articles
Copyright
Copyright © Materials Research Society 1990

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